Door check



EXAMINER K. KOLBUS DOOR CHECK May 5, 1953 Original Filed Feb. 11, 1946ATTORNEYS Reissued May 5, 1953 DOOR CHECK Karl Kolbus, Milwaukee, Wis.,assignor to The Seneca Manufacturing Company, Cleveland, Ohio, acorporation of Ohio Original No. 2,477,486, dated July 26, 1949, SerialNo. 646,822, February 11, 1946. Application for reissue September 11,1952, Serial No. 309,158

Matter enclosed in heavy brackets appears in the original patent butforms no part of this reissue specification; matter printed in italicsindicates the additions made by reissue.

6 Claims.

My invention refers to spring controlled door checks and it has for itsprimary object to provide a compact [convolute] spring and link con--nection to a piston rod, mounted in a cylinder, whereby a door, inapproximately full open position, neutralizes the spring pressure, whichpressure gradually increases when the door swings to a closed position,to thus insure full spring tension to hold the door positively shut andrelieve said pressure when fully opened.

A further object of my invention is to provide [all] a door checkactuating [mechanisms] mechanism within the confines of the" width of adoor jamb, whereby clearance is had to attach an outside screen doorwhen desired.

With the above and other objects in view, which will appear as thedescription proceeds, the invention resides in the novel construction,combination and arrangement of parts, substantially as hereinafterdescribed, and more particularly defined by the appended claims, itbeing understood that such changes in the precise embodiment of theherein disclosed invention may be made as come within the scope of theclaims.

In the accompanying [drawings] drawing is illustrated one completeexample of the physical embodiment of the present invention constructedaccording to the best mode so far devised for the practical applicationof the principles thereof.

In the [drawings] drawing:

Fig. 1 represents a plan sectional view of a door mechanism havingfitted thereto a spring controlled oheck embodying the features of myinvention, with parts broken away and in section to illustratestructural features, the section being partly indicated by line l-I ofFig. 3.

Fig. 2 is a similar sectional view illustrating the door check mechanismin its full open position.

Fig. 3 is a fragmentary longitudinal sectional view of the [same] springmechanism, the section being indicated by line 3-3 of Fig. 1.

Fig. 4 is a cross section through a bracket portion illustrating thepivotal connection [between the (same and a piston rodil'the sectionbeing indicated by the line 4-4 in Fig. 1.

Fig. 5 is a cross section through the piston rod, the section beingindicated by line 5-5 of Fig. 1; and

Fig. 6 is a cross section, as indicated by line B--6 of Fig. 1.

Referring by characters to the [drawings] drawing, A indicates a doorframe having hinged thereto a door B. Secured to the strips of the doorframe is a bracket I having extended therefrom a d i u n e p n whichStud is a lever 3 having a hub 3' retained thereon by a cotter pin.

The inner looped end of a convolute spring 4 engages the hub 3' and theouter coil of said spring is extended tangentially and secured to thebase of the bracket by means of a stud i interlocked with a slot in thespring end.

At a predetermined distance from the door hinge, a flanged clip 5 issecured thereto. A cylinder head 6 is secured to the clip by a pivotbolt 5', which bolt extends through companion ears of said clip andcylinder head.

A cylinder 1 is secured to the head 6 and the inner end of said cylinderhas secured thereto a second head 6', which second head is provided withfree vent apertures, as shown in Figure 5 of the [drawings] drawing andalso a central slot 8 for sliding engagement with a flat piston rod 9,the slot in said head serving as a guide for the same. As shown, eachhorizontal side of the piston rod extends in a plane which is normal tothe door face, thus providing a flat rod which can be of considerablebeam depth.

The outer end of the fiat piston rod 9 has secured thereto a piston 9'reciprocated within the cylinder. The inner exposed end of the flatpiston rod is formed with an extended elbow 9". which elbow is securedto the bracket I by a pivot bolt ill, the same being approximately at aright angle to the flat sides of the piston rod body.

The piston rod 9 at its junction with the elbow section 9" has pivotedthereto a flat link II the opposite end of which link is pivoted to theend of the lever 3. In the back and forth swing of the door the lever 3rotates upon its axis stud 2 through an arc of a circle approximatingdegrees, whereby the coil spring under constant tension is partly woundand unwound.

In the position of the parts assumed in Fig. 1, the spring is exertingapproximately a maximum tension upon the closed door through theadvantageous leverage arrangement as shown in Fig. 1.

When the door is swung to its open position, as illustrated in Fig. 2,the piston freely moves [downwardly] outwardly within the cylinder,while at the same time [it] the cylinder swings upon its pivotconnection 5 to exert a slight winding tension upon the spring as thelink II exerts an oscillating movement upon said lever, whereby, due tothe angular position with rela tion to the link and pivot point of thepiston rod elbow, the closing strain of the spring is neutralized,whereby the door may remain open, due

3 to the fact that its load is sufficient to resist closing.

From the foregoing description it will be apparent, due to the ,togglelink connections between the s'pring and piston rod, the door is firmlyclosed, and when fully opened, it may rest in this open position.However, the door closure control may be regulated due to the fact thatan air cushion is developed between the piston 9 and head 6. Theregulation of this cushion is obtained by a release vent 12 in the head6, and said vent may be entirely cut oil or varied by an adjustabletapered screw I! in threaded en agement with the release vent.

While the flat lever arrangement and pivotal locations thereof relativeto spring actuated lever 3, elbowed flat piston rod 9"-9 and pivot onbracket 1 are such that while obtaining maximum advantage of the storedenergy of the spring as the lever approaches door closed position, thebeam strengths of the link and piston rod can be quite substantial in adesign readily confined within the overall width of a door y'amb. Thus arugged construction of the lever, link, piston rod and piston rodbearing is afforded that can withstand the shocks and y'ars incident toa violent wind opening of the door.

I claim:

1. A door check comprising an angular bracket adapted to be secured to adoor frame within the confines of the door iamb of said frame, a studextending therefrom, a hubbed lever journalled upon the stud, aconvolute spring having its inner end secured to the lever hub and itsouter end secured to the bracket, a door check cylinder, a head mountedupon the inner end of the cylinder, a second head mounted upon the[inner] outer end of the cylinder, an air vent in said [second] outerhead, a clip adapted to be secured to a door in pivotal connection with[an] the outer head, a piston rod slidably guided in the [second] innerhead carrying a piston mounted in the cylinder, the exposed end of thepiston rod being provided with an elbow extension in pivotal union withthe bracket within the door opening and a link in pivotal union at oneend thereof with the piston rod elbow and in pivotal union at its otherend with [spring controlled] said lever.

2. A door check comprising a stud carrying bracket, a lever having a hubmounted upon the stud, a [convolute] convolute spring connected to thelever hub and bracket, a headed cylinder adapted to be pivotally securedto a door, a piston therein, a piston rod carried by said piston, thepiston rod terminating with an elbow approximately at a right angle tothe main portion of the piston rod, a pivot connection between thepiston rod elbow and bracket, a toggle link connecting [the springcontrolled] said lever and piston rod elbow, and adjustable means forventing one end of the cylinder.

3. A door check comprising an angular bracket adapted to be secured to adoor frame within the confines of the door famb of said frame, saidbracket having a base portion and a stud supporting portion extendingnormal to the base portion when the bracket is secured to an inner faceof a door y'amb, a flat lever carrying stud extending through the normalextending portion of the bracket structure, a flat lever. having ahubbed construction and carried by the stud with the flat side thereofdisposed adjacent the normally extending portion of the bracket, acoiled spring having one end thereof connected to the bracket structureand the other end connected to the lever through the hubbed constructionon the lever, a door check cylinder, a head mounted upon the outer endof the cylinder, at second head mounted upon the inner end of thecylinder, said first cylinder head being provided with an air ventvalve, said second head being provided with a rectangularly shapedpiston rod slideway bearing structure, a clip adapted to be secured to adoor in pivotal connection with the outer cylinder head, a flat pistonrod rectangular in cross section adapted to slide in the bearingstructure of the inner head, said piston rod having a width considerablygreater than its thickness and being pivotally connected at its outerend to said normal extending portion of the bracket with the flat sidethereof disposed parallel to said portion thereof, said piston rodhaving an approximate right angled bend therein to form a flat elbow,and a flat link pivotally connected at one end thereof to the lever andin pivotal union at its other end with the elbcw bend of the piston rodwhereby the force of the spring is exerted upon the door through thelever to the link and through the link to the door check piston andcylinder structures when the device is mounted on a doo famb between twodoors supported by the door famb structure.

4. A door check comprising an angular bracket adapted to be secured to adoor frame within the confines of the door famb of said frame, a studshaft extending therefrom, a hubbed, flat lever mounted umon the studshaft, a coiled spring! having it one end connected to the hub of thelever and its other end connected to the bracket, a cylinder, a headmounted upon the inner end of the cylinder, an outer head secured to theother end of the cylinder, a clip pivotally connected to the outer headand an air vent in the outer head, a piston rod slidably guided in theinner head carrying a p ston mounted on the cylinder, the exposed end ofthe piston rod being provided with an elbow extension in pivotal unionwith the bracket, and a link having an end thereof in pivotal union withthe piston rod elbow and its other end in pivotal union with said leverand disposed flatwise between the piston rod and the lever.

5. A door check comprising an angular bracket adapted to be secured to adoor frame within the confines of the door famb of said frame, a pivotstud extending from the bracket, a hubbed lever upon the stud, a coiledspring having one end thereof connected to the bracket and its other endconnected to the hub of the lever, a cylinder, a head mounted upon theouter end of the cylinder and provided with an air vent valve, a clipadapted to be secured to a door in pivotal connection with said head, asecond inner head,

a piston rod rectangular in cross section slidably guided in the secondhead and carrying a piston mounted in the cylinder, said rectangularpiston rod having a beam depth which is greater in a horizontaldirection than in a vertical direction and being pivotally connected atits outer ea:- tended end in a horizontally flat-wise relation to thebracket, said extended piston rod end having an elbow bend therein and aflat link having one end thereof in pivotal union with the elbowformation of the piston rod and having its other end in pivotal unionwith said lever.

6. A door check comprising a spring bracket adapted to be secured to adoor frame, a hubbed lever pivotally supported on the bracket, a coiledspring mounted on the bracket having one end thereof connected to thebracket and the other end connected to the lever hub, a cylinder, headsmounted upon the inner and outer ends of the cylinder, the outer headbeing provided with an air venting means and the inner head constitutinga, bearing for a piston rod which is rectangular in cross section with agreater dimension of the section extending horizontally, a rectangularsectioned piston rod slidably guided in the inner head bearing andcarrying a piston mounted in the cylinder, the piston rod having anelbow bend approximately at a right angle to the main portion of thepiston rod said bracket having a horizontally disposed wall to which theouter end of the rectangular piston rod is piootally connected inflatwise relation to said bracket wall, and a flat link in pivotal unionwith the elbow bend of the piston rod and with said lever.

KARL KOLBUS.

References Cited in the file of this patent or the original patent,

UNITED STATES PATENTS Number Name Date 7 527,753 Larsson Oct. 16, 1894?0 539,088 Shrawder May 14, 1895 J

